http://community.companyofheroes.com/forum/company-of-heroes-2/company-of-heroes-2-general-discussion/199424-coh2-faction-comparison
Working as intended
Though seriously, this sounds like mostly L2P issues. Every faction has hardcounters available and a well microed Kubel or Flak HT shuts down Con Spam hard early on and lets OKW start to get traction. Yes Volks can be hard to use at the early game stage and probably could use some kind of love but they are also cheap as chips and spammable. Should you try to outspam Con Spam? Nope. What should you do? Make good tactical use of sandbags and Strumpio flanking to win engagements and don't send Volks off on their own to go capping. I'm a big fan of the Strum officer in Breakthrough his Acc Aura makes Volks much more effective and his DPS is pretty good too. The ISG is also borderline OP this patch.
Shock Rifle is one of the better doctrines but its not OP. Shock Troopers are expensive and if you kite them between squads and don't let them close distance you can mitigate their damage. Mines and Cancer Grenades also are very effective. Will they win at close range? You bet. If a Soviet player is spamming them then they have serious deficits elsewhere and likely minimal AT, leaving them wide open to Luches Rape. KV8 is better now, but a serious fuel investment in AI and can let you exploit their lessened AT.
OKW elite infantry is mostly in a good place, Falls are a bit squishy for my tastes but they make up for it with their DPS and utility. Use them in cover and don't YOLO rush squads. Obers are overpriced IMO and could use a slight cost reduction... though their reinforcement cost reduction may help there but they are still good with LMG upgrade though. If Obers are losing to Penals you are using them wrong. JLI are very good IMO, you just need to use them at range and supporting other squads to utilize their sniping ability. Jadgpanzer 4 is pretty garbage though lol King Tiger could probably be slightly reduced in cost in light of past nerfs I agree but not much as its still very potent (just no longer mega Krupp Steel god)
The problem with your suggestions is that A) The fuel penalty is part of the core design of OKW and their unit costing (not to mention the 3vs3 and 4vs4 abuse that would result B) Would make OKW elites infantry too good and/or scale too quickly and abuse the Vet 5 system.
tl:dr Yes OKW could use some tweaking regarding unit cost and Volks early game but they aren't nearly as bad vs. Soviets as OP suggests.